CONTENTS OF VOL. III. 



INTRODUCTION. 



rago 



Historical Review of the attempts made with the object of 

 considering the Phenomena of the Universe as a Unity 

 of Nature 5-25 



SPECIAL RESULTS OF OBSERVATIONS IN THE 

 DOMAIN OF COSMICAL PHENOMENA 



A. Uranological portion of the physical description of the 



world. — a. Astrognosy 26-28 



I. The realms of space, and conjectures regarding that which 



appears to occupy the space intervening between the 

 heavenly bodies 29-41 



II. Natural and telescopic vision, 41-73 ; Scintillation of the 



stars, 73-83 ; Velocity of light, 83-89 ; Results of pho- 

 tometry, 89-102 41-102 



III. Number, distribution, and color of the fixed stars, 103- 



139; Stellar masses (stellar swarms), 139-143; The 

 Milky Way interspersed with a few nebulous spots, 

 143-151 103-151 



IV. New stars, and stars that have vanished, 151—160 ; Va- 



riable stars, whose recurring periods have been determ- 

 ined, 160—177; Variations in the intensity of the light 

 of stars whose periodicity is as yet uninvestigated, 177- 

 182 151-182 



V. Proper motion of the fixed stars, 182-185 ; Problemat- 



ical existence of dark cosmical bodies, 185—188 ; Par- 

 allax — measured distances of some of the fixed stars, 

 188-194; Doubts as to the assumption of a central 



body for the whole sidereal heavens, 194-199 182-199 



yj. Multiple, or double stars — Their number and reciprocal 

 distances. — Period of revolution of two stars round a 

 c(\mmon center of gravity . . 1 99-21 3 



